How to gap a Spark Plug? - Z06Vette.com - Corvette Z06 Forum
 
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post #1 of 12 (permalink) Old 02-17-2008, 10:55 AM Thread Starter
bbullitt01
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How to gap a Spark Plug?

I'm embarrassed to say, but I don't really know the correct method to gap a spark plug.

I have an unmodded 03 with the exception of long tube headers. I am installing NGK TR55 plugs. From what I have read here, the correct gap is 040 (Can someone confirm if this is true???).

The out of the box gap is much greater than 040, so I suspect I will have to decrease the gap. Do I simply tap the plug on a hard surface?
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post #2 of 12 (permalink) Old 02-17-2008, 11:01 AM
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Re: How to gap a Spark Plug?

Bullitt:

You can buy an inexpensive spark plug gap gauge (with built in tool for re-setting the gap) at any auto parts store.

Yes, you can close the gap by tapping on a hard surface, but suggest using the proper tool.




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post #3 of 12 (permalink) Old 02-17-2008, 02:36 PM
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0.040" seems too short. You may want to keep the out-of-box gap.

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https://www.z06vette.com/forums/f5/my...k-plugs-88774/

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post #4 of 12 (permalink) Old 02-17-2008, 04:49 PM
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Re: How to gap a Spark Plug?

Gap should be .055-.060"

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post #5 of 12 (permalink) Old 02-17-2008, 04:56 PM Thread Starter
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Re: How to gap a Spark Plug?

Thanks to all!
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post #6 of 12 (permalink) Old 02-18-2008, 09:16 PM
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Re: How to gap a Spark Plug?

NOOOOOOOOOOOOOO !!!!!!!!!!!

DO NOT TAP THE SPARK PLUG ON A HARD SURFACE TO CLOSE THE GAP !!!!!

Please, .....the proper way to close (or open) the gap on a spark plug is to use the spark plug electrode wrench fixture....usually found on a spark plug gapping tool.
After placing the slotted end of the tool on the plug electrode GENTLY and SLOWLY apply pressure and bend the elctrode in the appropriate direction. DO NOT HOLD or make contact with the WHITE insulator while doing this.

The white porcelin (think glass) insulator is fragile. Dropping or banging it will produce microscopic hairline cracks, which will cause electrical shorts, abehrrent current paths, loss of power and premature failure.

The 1st RULE of race mechanics is:
IF you drop a spark plug... throw it away!

IF you bang it on a hard surface the Rule applies!
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post #7 of 12 (permalink) Old 03-01-2008, 03:08 PM Thread Starter
bbullitt01
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Re: How to gap a Spark Plug?

Ok. Guess it's not a lawn mower

Last edited by bbullitt01; 03-01-2008 at 03:40 PM.
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post #8 of 12 (permalink) Old 03-01-2008, 03:30 PM
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Re: How to gap a Spark Plug?

you dont need the 55,s put the IR,s in and you can check IR,s but ya cant gap them
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post #9 of 12 (permalink) Old 03-01-2008, 03:41 PM
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Re: How to gap a Spark Plug?

Some use this tool.

I use this one.

The second tool allows you to open and close the gap with the tool.




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post #10 of 12 (permalink) Old 03-01-2008, 06:11 PM
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Quote:
Originally Posted by Jim Lembo View Post
Gap should be .055-.060"
Here you go. Keep the gapping tool handy for next time.

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post #11 of 12 (permalink) Old 03-01-2008, 06:53 PM Thread Starter
bbullitt01
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Re: How to gap a Spark Plug?

Got the second one. Just idn't know how to use it properly
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post #12 of 12 (permalink) Old 03-03-2008, 06:58 AM
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Re: How to gap a Spark Plug?

Try practicing on an old plug first. After a few times you should get a feel for it.
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